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fa5aafaac2
If a vector index is out of bounds, the result is supposed to be undefined but is not undefined behavior. Change the legalization for indexing the vector on the stack so that an out of bounds index does not create an out of bounds memory access. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@291604 91177308-0d34-0410-b5e6-96231b3b80d8
21 lines
876 B
LLVM
21 lines
876 B
LLVM
; RUN: llc < %s -march=mips -mcpu=mips2 | FileCheck %s -check-prefix=ALL
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; This test triggered a bug in the vector splitting where the type legalizer
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; attempted to extract the element with by storing the vector, then reading
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; an element back. However, the address calculation was:
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; Base + Index * (EltSizeInBits / 8)
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; and EltSizeInBits was 1. This caused the index to be forgotten.
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define i1 @via_stack_bug(i8 signext %idx) {
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%1 = extractelement <2 x i1> <i1 false, i1 true>, i8 %idx
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ret i1 %1
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}
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; ALL-LABEL: via_stack_bug:
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; ALL-DAG: addiu [[ONE:\$[0-9]+]], $zero, 1
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; ALL-DAG: sb [[ONE]], 7($sp)
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; ALL-DAG: sb $zero, 6($sp)
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; ALL-DAG: andi [[MASKED_IDX:\$[0-9]+]], $4, 1
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; ALL-DAG: addiu [[VPTR:\$[0-9]+]], $sp, 6
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; ALL-DAG: or [[EPTR:\$[0-9]+]], [[MASKED_IDX]], [[VPTR]]
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; ALL: lbu $2, 0([[EPTR]])
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